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acinetobacter baumannii

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https://www.readbyqxmd.com/read/28934482/mechanistic-insight-into-how-multidrug-resistant-acinetobacter-baumannii-response-regulator-ader-recognizes-an-intercistronic-region
#1
Yurong Wen, Zhenlin Ouyang, Yue Yu, Xiaorong Zhou, Yingmei Pei, Bart Devreese, Paul G Higgins, Fang Zheng
AdeR-AdeS is a two-component regulatory system, which controls expression of the adeABC efflux pump involved in Acinetobacter baumannii multidrug resistance. AdeR is a response regulator consisting of an N-terminal receiver domain and a C-terminal DNA-binding-domain. AdeR binds to a direct-repeat DNA in the intercistronic region between adeR and adeABC. We demonstrate a markedly high affinity binding between unphosphorylated AdeR and DNA with a dissociation constant of 20 nM. In addition, we provide a 2.75 Å crystal structure of AdeR DNA-binding-domain complexed with the intercistronic DNA...
September 19, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28934377/the-environmental-acinetobacter-baumannii-isolate-dsm30011-reveals-clues-into-the-preantibiotic-era-genome-diversity-virulence-potential-and-niche-range-of-a-predominant-nosocomial-pathogen
#2
Guillermo D Repizo, Alejandro M Viale, Vítor Borges, María M Cameranesi, Najwa Taib, Martín Espariz, Céline Brochier-Armanet, João Paulo Gomes, Suzana P Salcedo
Acinetobacter baumannii represents nowadays an important nosocomial opportunistic pathogen whose reservoirs outside the clinical setting are obscure. Here, we traced the origins of the collection strain A. baumannii DSM30011 to an isolate first reported in 1944, obtained from the enriched microbiota responsible of the aerobic decomposition of the resinous desert shrub guayule. Whole-genome sequencing and phylogenetic analysis based on core genes confirmed DSM30011 affiliation to A. baumannii. Comparative studies with 32 complete A...
September 1, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28932712/multidrug-and-co-resistance-patterns-of-non-fermenting-gram-negative-bacilli-involved-in-ventilator-associated-pneumonia-carrying-class-1-integron-in-the-north-of-iran
#3
Masoumeh Bagheri-Nesami, Mohammad Sadegh Rezai, Fatemeh Ahangarkani, Alireza Rafiei, Attieh Nikkhah, Gohar Eslami, Kheironesa Shafahi, Azin Hajalibeig, Rezvan Khajavi
INTRODUCTION: Ventilator-associated pneumonia (VAP) due to non-fermenting Gram-negative bacilli (NFGNB), especially Pseudomonas aeruginosa and Acinetobacter spp., is one of the main hospital-acquired infections leading to mortality and morbidity, especially in intensive care units (ICUs). This study seeks to determine the multidrug and co-resistance (MDR) patterns of NFGNB that are agents of VAP, and assess the presence of class 1 integron in these bacteria. METHODS: This cross-sectional study involved VAP patients admitted in the ICUs of 18 hospitals in the Mazandaran province, located in the North of Iran...
September 2017: Germs
https://www.readbyqxmd.com/read/28931235/monoclonal-antibody-protects-against-acinetobacter-baumannii-infection-by-enhancing-bacterial-clearance-and-evading-sepsis
#4
Travis B Nielsen, Paul Pantapalangkoor, Brian M Luna, Kevin W Bruhn, Jun Yan, Ken Dekitani, Sarah Hsieh, Brandon Yeshoua, Bryan Pascual, Evgeny Vinogradov, Kristine M Hujer, T Nicholas Domitrovic, Robert A Bonomo, Thomas A Russo, Magda Lesczcyniecka, Thomas Schneider, Brad Spellberg
Background: Extremely drug-resistant (XDR) Acinetobacter baumannii is one of the most commonly encountered, highly resistant pathogens requiring novel therapeutic interventions. Methods: We developed C8, a monoclonal antibody (mAb), by immunizing mice with sublethal inocula of a hypervirulent XDR clinical isolate. Results: C8 targets capsular carbohydrate on the bacterial surface, enhancing opsonophagocytosis. Treating with a single dose of C8 as low as 0...
August 15, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28929961/-national-antimicrobial-resistance-surveillance-system-namrss-external-quality-assessment-studies-2011-2016
#5
Serap Süzük Yıldız, Hüsniye Şimşek, Nilay Çöplü, Zeynep Gülay
Establishment of sustainable and evidence-based surveillance systems are recommended for prevention of microbial resistance by the World Health Organization (WHO). As a necessity of these surveillance systems, participants are recommended to implement an external quality assessment (EQA) program. In this scope, National Antimicrobial Resistance Surveillance System (NARSS) has been established within the Public Health Institute of Turkey (PHIT) in our country since 2011. In the scope of this surveillance, NARSS EQA program has been implemented in a cycle per year and four isolates were sent to participants per cycle every year since 2011...
July 2017: Mikrobiyoloji Bülteni
https://www.readbyqxmd.com/read/28925528/relatedness-of-wildlife-and-livestock-avian-isolates-of-the-nosocomial-pathogen-acinetobacter-baumannii-to-lineages-spread-in-hospitals-worldwide
#6
Gottfried Wilharm, Evelyn Skiebe, Paul G Higgins, Marie T Poppel, Ulrike Blaschke, Sarah Leser, Christine Heider, Magdalena Heindorf, Paul Brauner, Udo Jäckel, Karin Böhland, Christiane Cuny, Andżelina Łopińska, Piotr Kaminski, Mariusz Kasprzak, Marcin Bochenski, Olaf Ciebiera, Marcin Tobółka, Katarzyna M Żołnierowicz, Joachim Siekiera, Harald Seifert, Stéphanie Gagné, Suzana P Salcedo, Michael Kaatz, Franziska Layer, Jennifer K Bender, Stephan Fuchs, Torsten Semmler, Yvonne Pfeifer, Leszek Jerzak
The natural habitats and potential reservoirs of the nosocomial pathogen Acinetobacter baumannii are poorly defined. Here, we put forth and tested the hypothesis of avian reservoirs of A. baumannii. We screened tracheal and rectal swab samples from livestock (chicken, geese) and wild birds (white stork nestlings) and isolated A. baumannii from 3% of sampled chicken (n=220), 8% of geese (n=40) and 25% of white stork nestlings (n=661). Virulence of selected avian A. baumannii isolates was comparable to that of clinical isolates in the Galleria mellonella infection model...
September 19, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28919792/clinical-outcomes-and-nephrotoxicity-of-colistin-loading-dose-for-treatment-of-extensively-drug-resistant-acinetobacter-baumannii-in-cancer-patients
#7
Wasan Katip, Suriyon Uitrakul, Peninnah Oberdorfer
BACKGROUND: Colistin is a last-line defense therapy against extensively drug-resistant Acinetobacter baumannii (XDR-AB). Despite a loading dose of colistin being applied in many clinical practices, studies evaluating the effect of the loading dose of colistin in cancer patients remain limited. PATIENTS AND METHODS: A retrospective cohort study of cancer patients who received either a loading or non-loading dose of colistin for treatment of XDR-AB was conducted. For each group, the clinical response, bacteriological eradication and serum creatinine were recorded...
2017: Infection and Drug Resistance
https://www.readbyqxmd.com/read/28916373/methods-for-computational-disease-surveillance-in-infection-prevention-and-control-statistical-process-control-versus-twitter-s-anomaly-and-breakout-detection-algorithms
#8
Timothy L Wiemken, Stephen P Furmanek, William A Mattingly, Marc-Oliver Wright, Annuradha K Persaud, Brian E Guinn, Ruth M Carrico, Forest W Arnold, Julio A Ramirez
BACKGROUND: Although not all health care-associated infections (HAIs) are preventable, reducing HAIs through targeted intervention is key to a successful infection prevention program. To identify areas in need of targeted intervention, robust statistical methods must be used when analyzing surveillance data. The objective of this study was to compare and contrast statistical process control (SPC) charts with Twitter's anomaly and breakout detection algorithms. METHODS: SPC and anomaly/breakout detection (ABD) charts were created for vancomycin-resistant Enterococcus, Acinetobacter baumannii, catheter-associated urinary tract infection, and central line-associated bloodstream infection data...
September 12, 2017: American Journal of Infection Control
https://www.readbyqxmd.com/read/28916315/the-effect-of-immune-modulation-of-streptococcus-constellatus-sc10-strain-upon-acinetobactor-baumannii-infection
#9
Abdullah A Alyousef, Israa M S Al-Kadmy
Acinetobacter baumannii is a tiny, plump and rod-shaped Gram-negative coccobacillus, notorious as an opportunistic pathogen, which is now being considered by CDC as a serious public health threat. Preventing colonization may be a better therapeutic choice using microbiota to protect against A. baumannii transmission. Human microbiota not only regulates immune homeostasis as well provides essential health benefits therefore discovering the interface due microbiota in host immune system will allow to recognise novel immuno- or microbe-based therapies...
September 12, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28913903/acinetobacter-baumannii-isolated-from-hospital-acquired-infection-biofilm-production-and-drug-susceptibility
#10
Paweł Krzyściak, Agnieszka Chmielarczyk, Monika Pobiega, Dorota Romaniszyn, Jadwiga Wójkowska-Mach
Acinetobacter baumannii cause opportunistic nosocomial infections and is often multidrug resistant. It has ability to form biofilm. The possession of drug resistance mechanism and ability of biofilm formation seems to be the different way to enhancement of viability in stressful environment. In this study, we evaluate relation between these two factors. The biofilm formation was investigated in M63 medium with casein in microtiter plates, and the drug susceptibility was performed by disk diffusion methods. We found that 80-98% strains formed a biofilm...
September 15, 2017: APMIS: Acta Pathologica, Microbiologica, et Immunologica Scandinavica
https://www.readbyqxmd.com/read/28904355/highly-potent-antimicrobial-modified-peptides-derived-from-the-acinetobacter-baumannii-phage-endolysin-lysab2
#11
Shih-Yi Peng, Ren-In You, Meng-Jiun Lai, Nien-Tsung Lin, Li-Kuang Chen, Kai-Chih Chang
The increase in the prevalence of multidrug-resistant Acinetobacter baumannii (MDRAB) strains is a serious public health concern. Antimicrobial peptides (AMPs) are a possible solution to this problem. In this study, we examined whether AMPs could be derived from phage endolysins. We synthesized four AMPs based on an amphipathic helical region in the C-terminus of endolysin LysAB2 encoded by the A. baumannii phage ΦAB2. These peptides showed potent antibacterial activity against A. baumannii (minimum inhibitory concentration, 4-64 μM), including some MDR and colistin-resistant A...
September 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28900250/5-7-di-n-acetyl-8-epiacinetaminic-acid-a-new-non-2-ulosonic-acid-found-in-the-k73-capsule-produced-by-an-acinetobacter-baumannii-isolate-from-singapore
#12
Johanna J Kenyon, Anna Notaro, Li Yang Hsu, Cristina De Castro, Ruth M Hall
Nonulosonic acids are found in the surface polysaccharides of many bacterial species and are often implicated in pathogenesis. Here, the structure of a novel 5,7-diacetamido-3,5,7,9-tetradeoxynon-2-ulosonic acid recovered from the capsular polysaccharide of a multiply antibiotic resistant Acinetobacter baumannii isolate was determined. The isolate carries a sugar synthesis module that differs by only a single gene from the module for the synthesis of 5,7-diacetamido-3,5,7,9-tetradeoxy-L-glycero-L-altro-non-2-ulosonic acid or 5,7-di-N-acetylacinetaminic acid, recently discovered in the capsule of another A...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28899807/tn2008-driven-carbapenem-resistance-in-acinetobacter-baumannii-isolates-from-a-period-of-increased-incidence-of-infections-in-a-southwest-virginia-hospital
#13
Jayasimha Rao, Dwi Susanti, Johnathon C Childress, Michael C Mitkos, Joshua K Brima, Anthony W Baffoe-Bonnie, Samuel N Pearce, Dale Grgurich, Maria Jose Fernandez-Cotarelo, Thomas M Kerkering, Biswarup Mukhopadhyay
OBJECTIVES: The objectives of this study were to determine the genetic basis for carbapenem resistance in multidrug-resistant Acinetobacter baumannii strains isolated from patients affected by a sudden increase in the incidence of infections by such organisms in a tertiary care hospital in Virginia, USA, in 2009-2010 and to examine whether such strains are commonly encountered in the hospital setting. METHODS: The whole genomes of one outbreak strain, one carbapenem-resistant strain and one carbapenem-sensitive strain from sporadic infections in 2010-2012 were sequenced and analyzed...
September 9, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28895051/polymyxin-resistance-in-gram-negative-pathogens
#14
REVIEW
Pavithra Srinivas, Kaitlyn Rivard
PURPOSE OF REVIEW: The polymyxins are one of the last line antimicrobial classes to retain activity against multidrug-resistant Gram-negative bacilli. However, with the increased use of polymyxins in recent years, reports of resistance have also been increasing. We aimed to describe the mechanisms and occurrence of polymyxin resistance in Gram-negative organisms and propose strategies to overcome resistance. RECENT FINDINGS: The most common mechanism of acquired resistance to the polymyxins is via modification of the bacterial outer membrane lipopolysaccharide...
September 11, 2017: Current Infectious Disease Reports
https://www.readbyqxmd.com/read/28894700/targeting-the-type-ii-secretion-system-development-optimization-and-validation-of-a-high-throughput-screen-for-the-identification-of-small-molecule-inhibitors
#15
Ursula Waack, Tanya L Johnson, Khalil Chedid, Chuanwu Xi, Lyle A Simmons, Harry L T Mobley, Maria Sandkvist
Nosocomial pathogens that develop multidrug resistance present an increasing problem for healthcare facilities. Due to its rapid rise in antibiotic resistance, Acinetobacter baumannii is one of the most concerning gram-negative species. A. baumannii typically infects immune compromised individuals resulting in a variety of outcomes, including pneumonia and bacteremia. Using a murine model for bacteremia, we have previously shown that the type II secretion system (T2SS) contributes to in vivo fitness of A. baumannii...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28893775/a-nosocomial-outbreak-of-extensively-drug-resistant-xdr-acinetobacter-baumannii-isolates-containing-blaoxa-237-encoded-on-a-plasmid
#16
Andrea M Hujer, Paul G Higgins, Susan D Rudin, Genevieve L Buser, Steven H Marshall, Kyriaki Xanthopoulou, Harald Seifert, Laura J Rojas, T Nicholas Domitrovic, P Maureen Cassidy, Margaret C Cunningham, Robert Vega, Jon P Furuno, Christopher D Pfeiffer, Zintars G Beldavs, Meredith S Wright, Michael R Jacobs, Mark D Adams, Robert A Bonomo
Carbapenem antibiotics are among the mainstay for treating infections caused by Acinetobacter baumannii, especially in the Northwest United States where carbapenem resistant A. baumannii remain relatively rare. However, between June 2012 and October 2014, an outbreak of carbapenem-resistant A. baumannii occurred in 16 patients from 5 healthcare facilities in the state of Oregon. All isolates were defined as extensively-drug resistant (XDR). MLST revealed that the isolates belonged to sequence type 2 (international clone 2, IC2), and were greater than 95% similar by rep-PCR analysis...
September 11, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28893690/new-agents-for-the-treatment-of-infections-with-gram-negative-bacteria-restoring-the-miracle-or-false-dawn
#17
REVIEW
Hugh Wright, Robert A Bonomo, David L Paterson
BACKGROUND: Antibiotic resistance in gram-negative resistance has developed without a commensurate response in the successful development of antibiotic agents, though recent progress has been made. AIMS: This review aims to provide a summary of the existing evidence on efficacy, spectrum of activity and the development of resistance of new agents that have been licensed or completed advanced clinical trials that possess activity against resistant gram-negative organisms...
September 8, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28893449/successful-control-of-2-simultaneous-outbreaks-of-oxa-48-carbapenemase-producing-enterobacteriaceae-and-multidrug-resistant-acinetobacter-baumannii-in-an-intensive-care-unit
#18
A Robustillo-Rodela, V Pérez-Blanco, M A Espinel Ruiz, G Ruiz Carrascoso, J C Figueira Iglesias, D Abad Martín
BACKGROUND: This report describes a double outbreak of OXA-48-producing Enterobacteriaceae (OXA-48-PE) and multidrug-resistant Acinetobacter baumannii (MRAB) in an intensive care unit (ICU) and the effectiveness of measures implemented, including decontamination with vaporized hydrogen peroxide (VHP). METHODS: Affected patients were isolated in a confined area and cared for by dedicated personnel. Four percent chlorhexidine soap was used for patient daily hygiene...
September 8, 2017: American Journal of Infection Control
https://www.readbyqxmd.com/read/28893447/control-of-multidrug-resistant-acinetobacter-baumannii-in-hong-kong-role-of-environmental-surveillance-in-communal-areas-after-a-hospital-outbreak
#19
Vincent C C Cheng, Shuk-Ching Wong, Jonathan H K Chen, Simon Y C So, Sally C Y Wong, Pak-Leung Ho, Kwok-Yung Yuen
BACKGROUND: Environmental reservoir is an important source of multidrug-resistant Acinetobacter baumannii (MRAB) outbreaks. The role of postoutbreak environmental surveillance for guiding sustained infection control effort has not been examined. METHODS: Enhanced environmental disinfection and regular environmental surveillance of ward communal areas after an outbreak were performed in a university-affiliated hospital. To assess the usefulness of environmental culture in predicting patients with MRAB, weekly surveillance of communal areas was continued for 3 months after the outbreak in intervention wards...
September 8, 2017: American Journal of Infection Control
https://www.readbyqxmd.com/read/28892891/distribution-of-class-d-carbapenemase-and-extended-spectrum-%C3%AE-lactamase-genes-among-acinetobacter-baumannii-isolated-from-burn-wound-and-ventilator-associated-pneumonia-infections
#20
Maryam Mohammadi, Setareh Soroush, Somayeh Delfani, Iraj Pakzad, Abolfazl Abbaszadeh, Mahmoud Bahmani, Lidija Bogdanovic, Morovat Taherikalani
INTRODUCTION: Resistance to Acinetobacter baumannii is dramatically on the rise in Iran. Therefore, it is important to study resistance pattern among Acinetobacter isolates which is a common cause of nosocomial infections. AIM: To investigate antibiotic resistance patterns and the role of resistant genes and biofilm formation in the induction of resistance among Acinetobacter baumannii isolated from burn wound and ventilator associated pneumonia infections. MATERIALS AND METHODS: Total 103 isolates such as 33 burn samples from Rasool Akram Hospital and 70 isolates from ventilated patients in Shahid Motahhari Hospital were identified with A...
July 2017: Journal of Clinical and Diagnostic Research: JCDR
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